<style>
    /* (行内，id, 类，标签) */
    /* (0, 0, 0, 7) */
    div div div div div div div {
        color: red;
    }

    /* (0, 0, 1, 0) */
    .one {
        color: green;
    }
</style>

<div>
    <div>
        <div>
            <div>
                <div>
                    <div>
                        <div class="one">白日依山尽，黄河入海流。</div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>